I have gone through various input devices and found that the basic USB Logitechs with scroll wheel work well for me; however the SmartFish is my first preference for editing and doesn't demand batteries too much.

A bit off-topic: Can you guys tell me what you can do with the numeric keypad in LR? I've been using the castrated Apple keyboard for ages and now you got me thinking I'm wondering if I'm missing something.

I am a fan of compact keyboards so that I can keep the mouse closer. I have 4 Happy Hacking Professional keyboards. These and other excellent keyboards (mechanically switched) can be bought from Elite Keyboards. I even gave one to my Mom, who was a skeptic, and now she also loves it.

A bit off-topic: Can you guys tell me what you can do with the numeric keypad in LR? I've been using the castrated Apple keyboard for ages and now you got me thinking I'm wondering if I'm missing something.

The Keypad is handy for rating; 1-5 numeric, 6-9 colors - works in library, develop and print modules....

Matias just announced a new, quieter keyboard that claims to provide the same great tactile feedback as their previous model. I'm old enough to remember the great touch feedback from the original IBM PC keyboard and plan to look into this when I replace my computer later this year. Here is the Engadget link.